&BUNCH_SETUP
!======================================
! Choose lattice here

   this_lat = '/nfs/cesr/online/machine_data/lattice/cesr/bmad/chess_arc_pretzel_20120822.lat'

!======================================
! Choose lrbbi parameter file here
   lrbbi_file = lrbbi_chess_arc_pretzel.in
!
!======================================
! Choose tunes here. 
! Choose zero for design tunes

! CHESS tunes 15 Sep Characterization
   qx = 0.
   qy = 0.
   qz = -0.046 ! 0 for 4d tracking, finite value will use 6d tracking
!======================================
! Set CONSTANT_TUNES true if tunes are to be
! readjusted to the default or chosen value
! for all values of positron bunch current
   constant_tunes = .false.
!   constant_tunes = .true.

!======================================
! Set pretzel here. Zero values result
! in choosing the design values.
   prz1 = 0.
   prz13 = 0.

!======================================
! Perform dynamic aperture calculation?
   calc_dynap = .true. 
!   calc_dynap = .false.

!=======================================
! If this file name is present, a 
! weighted modification of ring element
! parameters will be carried out.
!  ringmod_file = et2b1pt1b1.out
!  ringmod_file = knob.dat
!  ringmod_file = negknob.dat
/